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Coloured LED lighting was installed in 2013, allowing it to be lit up to mark significant dates or achievements.
The last 18 months have seen a big rise in requests to light the building up from support groups, in relation to medical conditions or diseases.
A report said the council was unable to recognise all of these, and that all should be refused under a new policy.
If the lighting was used too frequently, "the overall impact is diminished", added the report.
The details were outlined as part of a report submitted to Belfast City Council's Strategic and Policy Resources Committee.
Councillors on the committee are set to discuss the proposed policy on Friday.
The building is currently illuminated on 10 agreed days during the year, but the council also considers requests from charities and significant anniversaries.
The report said: "It is clear from social media and tourist feedback that the system has demonstrably enhanced the City Hall's image as a notable landmark."
However, it added that the new lighting had also resulted in "a significant number of requests for access of types not foreseen when the system was implemented".
The report said a total of 203 requests had been received in addition to the agreed list of recognised days since the system went live in 2013.
It said many of the requests were for "very worthy and important causes and very emotive issues".
But it said there were now more than 140 such diseases, conditions and other special days currently recognized internationally by the United Nations.
The report said it "would clearly not be possible to recognise all of these, so clear criteria are needed".
Councillors are being asked to approve new criteria for requests to light up Belfast City Hall.

Cheshire West and Chester Council has launched a consultation on whether to end its "Free After Three" scheme.
Businesses in the city have complained that reintroducing parking charges would hit their trade.
The council says "better alternatives" may be developed during a 12-week consultation period which is under way.
The proposals are part of a new parking strategy drawn up for the local authority by consultants, designed to ensure "better quality" and "sustainable" parking.
Labour councillor Karen Shore said: "No decisions have been taken yet, but we believe that some of the alternative proposals will actually be better in terms of the experience for shoppers and the footfall for businesses."
The strategy recommends replacing the "Free After Three" scheme with bus discounts and shorter periods of free parking to "encourage trade throughout the day".
Free parking would also be scrapped in nearby Ellesmere Port, where it is said to be having "only a limited effect" in boosting the economy.
Christian Bartley, from Back Alley Music in Chester, said reintroducing evening parking charges would "take away even more customers for us".
"I was gobsmacked," he added. "It's just going to make it even harder for us to keep our customers coming here."
A popular scheme allowing drivers to park for free in Chester city centre after 15:00 could be scrapped as it causes "pressure" on rush-hour traffic.

Knife crime in the city has risen to a four-year high following a relatively steady increase since June 2014.
In June 2012 there were 1,719 recorded stabbings of people aged under 25 in the capital compared with 1,749 in August 2016, the report found.
It said gang activity accounted for less than 5% of London knife crimes.
Steve O'Connell, one of the report's authors who leads the Police and Crime Committee (PCC), said: "This is significant, because not many people realise that if you only look at gang violence you won't make much difference to what is happening with knife crime."
Nationally knife crime rose last year for the first time in four years in England and Wales.
The PCC report suggests the dominant driver for young people carrying knives, "appears to be a belief that they need to be prepared to defend themselves." It says fear can also be fuelled by awareness of stabbings in their community.
"If a serious incident occurs, there needs to be a concerted effort by the police and other agencies to reassure young people that they are safe," the report says.
The Met Police said knives were involved in about half of all serious youth crime recorded in London last year, and about a quarter of those victims were girls and young women.
"We know that if you carry a knife you are far more likely to get stabbed, probably with that knife," Matt Watson, of the Integrated Gangs Unit added.
Graham Robb from youth charity Redthread said knife crime tended to show "spikes of volatility" and this rise could be an example of such a spike.
The Met Police said most youth knife crime was committed with regular knives that were readily available in the home. It said intelligence led stop and search was critical to removing those knives from the streets.
In July, London Mayor Sadiq Khan announced Â£400,000 funding to help tackle knife crime.
A spokesman for his office said he would carefully consider the findings of this report and next month he would host a knife crime summit.

Fear of violent crime is encouraging young people in London to carry knives, resulting in a rise in stabbings, a police and crime report suggests.

